Preparation of TiB2-Al2O3 and CrB2-Al2O3 composites with a broad range of phase composition was conducted by self-propagating high-temperature synthesis (SHS) involving reaction of different types. The formation of fibrous crystals of aluminum oxide with length of about 10-25 microns and with diameter of 200-500 nm at self-propagating high-temperature synthesis in the system 2B2O3-Cr2O3-6A1 was established. Thermite mixtures of Al-TiO2 and Al-TiO2-B2O3 were incorporated with the Ti-B combustion system to produce the composites of TiB2-Al2O3, within which the increase of the thermite mixture for a higher content of Al2O3 decreased the reaction temperature and combustion wave velocity. This implies that the thermite reaction of Al with TiO2 reduces the exothermicity of the overall SHS process. It was found that adoption of B2O3 as one of the thermite reagents improved the product formation effectively. For investigate the combustion wave in 0.75TiO2-0.25Ti-2B-Al system the «quenching» method was used. The XRD analysis shows that the final products containing diborides and aluminium oxide.
In the oil industry, it is important to increase the mobility of hydrocarbon fluids (oil and/or gas) and decrease the mobility of water. Doing so results in an increase in oil production and a decrease in unwanted water production. Polymers have been widely used to increase water viscosity, causing a decrease in water mobility. Surfactants have been used to change reservoir wettability and to clean the rock surface. The use of surfactants changes the formation wettability from oil wet to water wet. This results in an increase in oil production from various water wet sandstone and carbonate formations. Low water salinity has also been used to enhance oil recovery. The mobility of the oil should be more than the mobility of the water to ensure maximum extraction efficiency. As a result, viscosity measurements are very important in determining the impact of a viscous fluid in enhanced oil recovery (EOR). We measured the viscosity of mixed fluids used in the oil industry such as brines of varying concentration (Sodium Chloride and Calcium Chloride solutions) and various polymer solutions at different temperatures.
The possibility of obtaining multicomponent refractory composition materials on the basis of quarts containing raw material by SHS method was studied. The use of a modifying carbon additive in the form of graphite power, carbonized rice husk, apricot stones and shungit was considered. It is shown that a complex use of preliminary mechanochemical activation (MA) and modification of the charge mixture with carbon containing additives contributes to formation of carbide and nitride phases in synthesis products.
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